Publishers
- Cicerone Press 3
- Cirencester Newspaper Company 1
- Cirrus Associates 1
- Citta Di Torino 1
- City Of Birmingham 1
- City Of Portsmouth 1
- City Of Worcester 1
- Civil Aviation Authority 1
- Claremont Books 1
- Clarendon Press 16
- Clarion Books 1
- Clarke Printing 1
- Clarkes New Press 1
- Classic 1
- Classic Publications 1
- Clearview 1
- Clement Ingleby 1
- Clifton Books 1
- Climber's Club 2
- Clive Holloway Books 2
- Clwydian-Press 1
- Clymer 2
- CMG Publishing 2
- Co-operative Wholesale Society 2
- Coachbuilt Press 1
- Cobden-Sanderson 1
- Cobham Plc 1
- Cocorico 1
- Colin A Pomeroy 1
- Colin Baxter Photography Ltd. 1
- Colin Brent Books 2
- Colin Buchanan And Partners 1
- Colin Orchard 1
- Collection Parthenope 1
- Collectors' Books 1
- Collet's 1
- Collier Macmillan Publishers 2
- Collins 468
- Collins and Harvill 4
- Collins Clear-Type Press 92
- Collins Colour Camera Books 1
- Collins Lions 2
- Collins Voyager 1
- Collins Willow 3
- Colmans Foods 1
- Colnaghi And Co. 1
- Colnet 2
- Colorado Railroad Museum 1
- Colorgravure 1
- Colour Library Books 2
- Colour Library Direct 2
- Colourbox Publishing 1
- Colourpoint 1
- Columbia University Press 4
- Combined Publishing 2
- Comma International 1
- Commission Of Conservation Canada 1
- Commonwealth Agricultural Bureaux 1
- Commonwealth Scientific And Industrial Research Organization 1
- Commonwealth War Graves Commission 2
- Company Of Stationers 1
- Compassverlag 1
- Comstock Publishing Associates 2
- Comstock Publishing Company Inc. 1
- Concord Publications Co. 1
- Connaissance Du Rail 4
- Consejo Superior De Investigaciones Cintificas 1
- Conservation Press 1
- Consiglio Nazionale Delle Ricerche 1
- Constable 12
- Constable & Co. Ltd. 21
- Constable and Company Ltd. 21
- Constable Young Books 3
- Constable Young Books Ltd. 1
- Contact Publications Limited 1
- Continuum 1
- Conway 2
- Conway Maritime Press 16
- Copernic 1
- Copernicus 1
- Coppenrath 1
- Copple House Books 1
- Corgi 1
- Corgi Yearling Books 1
- Cornell University Press 5
- Cornish Brothers Limited 4
- Cornmarket 1
- Cornstalk Publishing 1
- Cornstalk Publishing Company 1
- Costello 1
- Cote D'Or 1
- Coterie Press Limited 7
- Council Of Museums In Wales 1
- Country & Sporting Publications 1
- Country Life 20
- Country Life Books 1
- Country Life Limited 16
- Country Life Ltd. 9
- Countryside Books 5
- Courage Books 1